That's a relatively broad question, but here's a bit of info for at least
part of it that might help.
Communicating with web services using the CF is easy in many cases. Often
you don't even have to worry about creating a connection. Instead, you can
just call the proxy method generated by VS .NET and let the CF handle
connecting (if necessary) under the covers. The MySmartBus app
(
http://enfieldfamily.com/mysmartbus) runs on a Smartphone (in my case,
using GPRS), gets data from a web service, and doesn't contain any
connection management code at all. I think - although I've never done it
myself - that things would work similarly if I had a PPC with Wi-Fi.
Here's some more info on communicating with web services using the .NET CF:
http://enfieldfamily.com/PermaLink.aspx/ff062b06-7a8d-4aef-bf1e-e2a03f96be2e.
As for SMS, I've not done this myself, but know I've seen a bunch of posts
probably related to the topic. The OpenNETCF.org folks have a
OpenNETCF.Phone.Sms namespace for 'phone enabled Windows Mobile devices,'
which probably means Smartphone or Pocket PC Phone Edition machines. Even if
your devices don't have phone functionality, that might at least be a place
to start.
